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No, you don’t technically need a cement backer board for a wall tiling project, but not using it risks disastrous moisture damage. Cement is naturally water-resistant, whereas drywall soaks it in, which can lead to warping or mold growth. Always use a backer board treated with a waterproof membrane for bathrooms and other chronically damp areas to ensure complete tile shower waterproofing.

Mortar and thinset both serve the same purpose—tile adhesion—but have different compositions and use-cases. Thinset is heatproof and presents a wide range of possibilities due to the added polymers. Mortar is typically used for bonding stones and brick. Thinset is rarely used outside, while mortar is rarely used inside.

There isn’t a one-size-fits-all best tile for a dog shower. Consider your budget, tile durability, aesthetics, and, most importantly, practicality. Avoid tiles your dog will slide around on. Pebbles are a great non-slip option, but are pricey and tricky to install. Glass might look modern, but it’s not scratch-resistant. Small, floor-rated ceramic or porcelain tiles are economical and have many grout lines that make the surface more slip-resistant. Pick a matte finish rather than a shiny tile if you want it to hide stray mud and hairs better.

When considering the types of grout for your project, unsanded grout is the best choice for penny tile. Unsanded grout can fit better into narrow spaces, like those between the small penny tiles, and it’s easier to smooth out for a seamless finish. However, if you’re unsure, check with a tile installation pro to determine which grout is best for your specific project.